Field Trips are scheduled at various times throughout the year as interest is shown on particular trips. Time and locations are announced on Facebook, by email to members, and on this web site. When time permits the trips are also announced in the newsletter. You are cordially invited to join GCGMS and join us on our trips.

  • All people on a trip are required to be a member of GCGMS and to sign an Assumption of Risk Form.
  • Please sign up in advance and get the details about where we will meet. Do not plan on just showing up.
  • The club does not charge for field trips, but sometimes there are fees to get into a site.
  • A junior member (or other minor) may go on field trips provided he or she is accompanied by a member who is the parent, guardian, or sponsor. A sponsor must have written consent from a parent or guardian.

Members should read, understand, and adhere to the Code of Ethics as adopted by the American Federation.


Trips Currently Scheduled

Field Trip: Canyon Lake Gorge Tour

The date:  Saturday, May 20, 2017

Time:  9:00 AM

Where:  Canyon Lake Gorge, North of San Antonio, in the hill Country.

Cost: $10.00 per person only 23 slots are available on the 20th.

The Canyon Lake Gorge is open to the public for guided tours only. Each 3-hour tour is led by a volunteer certified Gorge Preservation Society Guide with assistance from trained Docents.

After the tour – We will all meet in the town of Blanco, Texas at 2:00 PM Saturday afternoon. Blanco only has one red and green stop light in the center of town. At this stoplight is a large two-story old Count House building in the town square. We will meet there after lunch.


After lunch, visit the Dinosaurs tracks in the Blanco riverbed. The tracks on the river bottom are from the Sauropod, the largest dinosaurs known.  Hopefully, the tracks will be seen if the river is not too high.

Then we will take a short drive to dig for fossils. The fossils will be dug in a road cut, in the layers of the Glen Rose Limestone. The Glen Rose fossils are similar to those that we will see earlier in Canyon Lake Gorge.   You can keep what you find.

Next Step: Log on to the Canyon Lake Gorge Website:  Schedule your Tour for the 20th.

When you pay for the tour they will send you detailed information and consents. This tour was opened Wed. to the public. So, sign up as soon as possible.

Call Karen Shaffer for more information. 502-376-6225

Note: Good Website will identify what you will see.

Public and group tours are available to ages 7 and up only. Chaperones are required for ages 7-20: Ages 7-10, one adult for every child, ages 11-15, one adult for every three children and ages 16-20, one adult for every five teens.

No pets are allowed. No rock or fossil collecting is allowed on Gorge tours.

Walking through the Gorge can be physically demanding, and is not recommended for people with heart conditions, bad knees, ankles or in poor physical health.

Restrooms are located at the top, half way on the tour and at the bottom of the Gorge.

Good walking shoes and bottled water are required. Everyone is encouraged to bring a backpack so that their hands will be free.


Canyon Lake Gorge

It took 100 million years to create this site!

During one week in the summer of 2002, more than 34 inches of rain fell in the upper watershed of the Guadalupe River, setting off a torrent of floodwater that carved a perfectly fascinating geological wonder—the Canyon Lake Gorge—out of the earth.

The flood roared through the Hill Country northwest of New Braunfels, tearing away soil, ripping up huge trees, crumpling houses and sending a rush of water from swollen Canyon Lake over its spillway for the first time since the reservoir was completed in 1964.

The historic flood sliced open the ground below the spillway, creating a gigantic 64-acre Gorge and exposing ancient, crustaceous limestone, fossils and even dinosaur footprints 110 million years old.

It is a textbook example highlighting Hill Country geology and the exposed Trinity Aquifer, clearly showing faults, fractures and seeps in the limestone. Limestone layers created from an ancient sea are visible, and visitors admire waterfalls and springs where the aquifer is exposed.

The Gorge is a real-life classroom in which visitors learn how the aquifer’s underground permeable rock cavities soak up, store, and move rainwater that many in Central Texas depend on for drinking water and irrigation.

Geologists and oil company representatives come to study the faults and fracturing of the Gorge’s limestone.

And the Gorge gives Tour Participants an opportunity to explore dinosaur tracks and perfectly preserved fossils, exposed for the first time in millions of years. Fossilized sea urchins are so perfectly preserved that one can see the spines and the minute seams along the creatures’ bodies. One can even see fossilized ocean ripples in the limestone.




Pictures and articles from previous field trips

McFadden Beach, Sept. 26, 27, 28, 2014

Field trip to Blanco, Texas.

Arkansas Quartz Crystals Field Trip 2016